CATERPILLAR 910F Wheel Loader Electrical System Owner’s Manual

: August 28, 2024
: CATERPILLAR

Table of Contents

Electrical Schematic Symbols And Definitions
Harness And Wire Electrical Schematic Symbols
Electrical Schematic Symbols And Definitions
Resistor, Sender and Solenoid Specifications
Off Machine Switch Specifications
References
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SENR5945
March 1993 910F Wheel Loader
Electrical System
1SF1104-UP

Electrical Schematic Symbols And Definitions

| Pressure Symbol
---|---
| Temperature Symbol
| Level Symbol
| Flow Symbol
| Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
---|---
| Normally open switch that is closed due to an applied condition, and will open again with a specific decrease in that condition.
| Normally closed switch that will open with an increase of a specific condition.
| Normally closed switch that is open due to an applied condition, and will close again with a specific decrease in that condition.
| The circle indicates that the component has screw terminals and a wire can be disconnected from it.
| No circle indicates that the wire cannot be disconnected from the component.
| This indicates that the component has a wire connected to it that is connected to ground.
| This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.

Harness And Wire Electrical Schematic Symbols

|
---|---
Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.| Typical representation of a Sure-Seal connector. The plugand receptacle contain both pins and sockets.

Electrical Schematic Symbols And Definitions

| FUSE – A component in an electrical circuit that will open the circuit if too much current flows through it.
---|---
| REED SWITCH – A switch whose contacts are controlled by a magnet. A magnet closes the contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.
| SENDER – A component that is used with a temperature or pressure gauge. The sender measures the temperature or pressure. Its resistance changes to give an indication to the gauge of the temperature or pressure.
| RELAY (Magnetic Switch) – A relay is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close the switch part of the relay.
| CIRCUIT BREAKER (C/B) – A component in an electrical circuit that will open the circuit if too much current flows through it. This does not destroy the circuit breaker and it can be reset to become part of the circuit again.
| SOLENOID – A solenoid is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close a valve or move a piece of metal that can do work.
| MAGNETIC LATCH SOLENOID – A magnetic latch solenoid is an electrical component that is activated by electricity and held latch by a permanent magnet. It has two coils (latch and unlatch) that make electromagnet when current flows through them. It also has an internal switch that places the latch coil circuit open at the time the coil latches.

Diagnostic Code Conversion

Code Flashed	CID – FMI	Description
11	No ACTIVE Faults	Not applicable.
12	No INACTIVE Faults	Not applicable.
21	368 – 02	Auto/manual switch signal not correct.
22	621 – 02	Downshift switch signal not correct.
24	190 – 08	Engine speed sensor signal not valid.
25	191 – 08	Transmission speed sensor signal not valid.
31	641 – 05	Solenoid 1 open circuit.
32	642 – 05	Solenoid 2 open circuit.
33	643 – 05	Solenoid 3 open circuit.
34	644 – 05	Solenoid 4 open circuit.
35	645 – 05	Solenoid 5 open circuit.
36	646 – 05	Solenoid 6 open circuit.
41	641 – 06	Solenoid 1 short to ground.
42	642 – 06	Solenoid 2 short to ground.
43	643 – 06	Solenoid 3 short to ground.
44	644 – 06	Solenoid 4 short to ground.
45	645 – 06	Solenoid 5 short to ground.
46	646 – 06	Solenoid 6 short to ground.
51	641 – 03	Solenoid 1 short to + battery.
52	642 – 03	Solenoid 2 short to + battery.
53	643 – 03	Solenoid 3 short to + battery.
54	644 – 03	Solenoid 4 short to + battery.
55	645 – 03	Solenoid 5 short to + battery.
56	646 – 03	Solenoid 6 short to + battery.
61	660 – 02	Invalid shift lever input line 12.
62	661 – 02	Invalid shift lever input line 13.
63	662 – 02	Invalid shift lever input line 14.
64	663 – 02	Invalid shift lever input line 15.
65	664 – 02	Invalid shift lever input line 16.
66	665 – 02	Invalid shift lever input line 17.
67	666 – 02	Invalid shift lever input line 18.
68	667 – 02	Invalid shift lever input line 19.
69	668 – 02	Invalid shift lever input.
71	168 – 00	System voltage above normal.
72	168 – 01	System voltage below normal.
74	650 – 02	Invalid harness code.

ACTIVATION OF DIAGNOSTIC INDICATOR OPERATIONS (Quick Reference

Operation	Contact 1¹	Contact 3 ¹	Contact 5 ¹
To Scroll ACTIVE Faults	Ground ²	Open	Open
To Scroll INACTIVE Faults	Open	Open	Ground ²
To Clear ³ Faults	Open	Ground	Open

These contacts are located in the harness code connector.
Remove the connection to ground to place the desired information shown during scrolling on-hold.
fault is cleared only while it is on-hold. A fault that is active cannot be cleared.

MACHINE HARNESS CONNECTOR AND COMPONENT LOCATIONS
Component Location

Component	Schematic Location	Machine Location
Alarm – Backup	E-12	1
Alarm – Backup (COSA Roading)	C-12	1
Alarm – Parking Brake	B-5	A
Alternator	D-11	2
Batteries	C-11 , B-11	3
Breaker – Aux	E-11	4
Breaker – Lamp	E-6	A
Breaker – Main	E-11	4
Control – Autoshift	C-3	5
Control – Primary Steering	E-5	A
Control – Secondary Steering	E-5	A
Control – Shift	E-8	C
Converter – Voltage	D-5	D
Flasher	D-8	A
Fuses	F-6, E-6	A
Gauge – Coolant Temp	C-7	A
Gauge – Fuel Level	C-7	A
Gauge – Oil Pressure	C-7	A
Gauge – Torque Converter Oil Temp	C-7	A
Ground – Engine	D-11	4
Ground – Frame	F-5, D-10	6
Heater Air Intake	F-11	7
Horn – Forward	E-2	8
Horn – Forward (COSA Roading)	C-1	8
Horn – Forward (Japan Roading)	F-1	8
Lamp – Alternator	E-6	A
Lamp – Brake Level	D-6	A
Lamp – Diagnostic (Autoshift)	C-3	9
Lamp – Heater Air Intake	D-6	A
Lamp – Neutral Override	D-6	A
Lamp – Parking Brake	C-6	A
Lamp – Primary Steering	D-6	A
Lamp – Ride Control	D-6	A
Lamp – Secondary Steering	D-6	A
Meter – Service (Hour)	E-7	A
Motor – Blower A/C	D-8	10
Motor – Blower	D-9	10
Motors – Front And Rear Washers	F-7	11
Motor – Front Wiper	C-5	12
Motor – Rear Wiper	F-10	13
Motor – Starting	E-11	14
Relay – Heater Air Intake	F-11	15
Relay – Main	F-6	A
Relay – Parking Brake	B-5	A
Relay – Start	E-11	4
Resistor – Alternator	E-6	A
Resistor – Blower Motor Speed	D-9	10
Sender – Coolant	C-11	16
Sender – Engine Oil Pressure	B-11	17
Sender – Fuel level	F-7	18
Sender – Torque Converter Temp	E-10	19
Sensor – Engine Speed	A-11	20
Sensor – Trans/Speedo	F-6	21
Solenoid – A/C Clutch	B-11	22
Solenoid – Bucket	A-8	23
Solenoid – Engine Shutdown	C-11	24
Solenoid – Lift	A-8	25
Solenoid – Ride Control	E-2	26
Solenoid – Ride Control (COSA Roading)	C-1	26
Solenoid – Ride Control (Japan Roading)	F-1	26
Solenoid – Start Aid	A-11	27
Solenoids – (1-6) Transmission	A-9	19
Speedometer	D-7	A
Switch – A/C Blower	B-9	B
Switch – A/C Refrigerant Pressure	B-11	22
Switch – Beacon	D-9	C
Switch – Brake Level	A-7	28
Switch – Bucket Positioner	D-2	29
Switch – Bucket Positioner (COSA Roading)	B-1	29
Switch – Bucket Positioner (Japan Roading)	E-l	29
Switch – Coolant	C-11	16
Switch – Dimmer	F-2	30
Switch – Disconnect (COSA Attach)	B-11	31
Switch – Disconnect (Japan Attach)	B-11	31
Switch – Flood Lamp	B-7	A
Switch – Front Wiper	B-8	A
Switch – Horn	D-8	C
Switch – Key Start	C-9	A
Switch – Lift Kickout	D-2	32
Switch – Lift Kickout (COSA Roading)	B-1	32
Switch – Lift Kickout (Japan Roading)	E-1	32
Switch – Neutral Override	B-6	A
Switch – Parking Brake	F-5	A
Switch – Primary Steering Flow	F-7	33
Switch – Rear Wiper	C-8	A
Switch – Ride control	C-8	A
Switch – Running Lamp	B-8	A
Switch – Secondary Steering Flow	C-2	34

Switch – Secondary Steering Flow

(COSA Roading)

| B-1| 34
Switch – Secondary Steering Flow

(Japan Roading)

| E-1| 34
Switch – Start Aid| C-6| A
Switch – Stop Lamp| D-5| 35
Switch – Thermostat| D-9| 10
Switch – Trans Auto/Manual (Autoshift)| D-9| C
Switch – Trans Neutralizer| D-5| 35
Switch – Transmission Down Shift (Autoshift)| A-4| B
Switch – Turn Signal| E-8| C
Switch – Wiper Intermittent| A-10| A

Machine locations are repeated for components located close together. A = Components located in the dash.
B = Components located on the right console.
C = Components located in steering column area.
D = Components located in the headliner.
Related Electrical Service Manuals

Title	Form Number
Alternator: K1/N1	SENR3685
Electronic Transmission Control System	SENR5751
Starting Motor: Reduction Type R5.5	SENR3828

Harness Connector Location

Connector| Machine
Location| Harness And/Or
Components| Schematic
Location| | Connector| Machine
Location| Harness And/Or
Components| Schematic
Location
---|---|---|---|---|---|---|---|---
40 CONTACTS| •| Autoshift Control N – 8Y7958| B-3| 6 CONTACTS| 5| B – 9Y7586
F – 8Y7584| F-6
12 CONTACTS| 1| A – 101966
B – 8Y7586| A-6| A| B – 9Y7586
L – 8Y7880 Standard| B-5
2| A – 101 91 66
K – 8Y7595| A-11| A| B – 9Y7586
X – 1019156 Attachment| B-5, B-4
2| A – 1019166
T – 4Y7439 (Japan Roading)| A-11, D-12| 6| B – 9Y7586
M – 8Y7881| F-8
2| A – 1019166
U – 1019168 (COSA Roading)| A-11 ,C-12| 7| B – 9Y7586
N – 8Y7958 Attachment| A-7, A-3
3| B – 8Y7586
C – 8Y7583| F-9| 7| B – 9Y7586 KK – 1019159| A-7
•| B – 8Y7586 Shift Control| E-8| •| B – 8Y7586
Flasher (German Roading)| D-8
1| B – 8Y7586 Standard
E – 1019165 Standard| A-6| •| B – 8Y7586 Lift/Bucket Solenoids| A-8
1| B – 8Y7586 Standard
N – 8Y7958 Attachment| A-6, A-4| •| B – 8Y7586 Shift Control| E-8
1| E – 1019165 Standard N – 8Y7958 Attachment| A-6, A-3| •| L – 8Y7880
Front Wiper Motor| C-5
9 CONTACTS| •| B – 9Y7586
Cluster Gage Group| C-8| •| L – 8Y7880
Rear Wiper Motor| 0.00E+00
4| N – 8Y7958 Data Link Plug| C-2| •| L – 8Y7880 Voltage Converter| D-5
8 CONTACTS| 1| B – 9Y7586
D – 8Y7597| A-5| 8| R – 4Y7438
T – 4Y7439| D-12
1| B – 9Y7586
D – 4Y7536 (Japan Roading)| A-5,F-2| •| S – 1019167
LH Turn Lamp (COSA Roading)| C-2
1| B – 9Y7586
S – 1019167 (COSA Roading)| A-5,B-2| •| S – 1019167
RH Turn Lamp (COSA Roading)| B-2
A| B – 9Y7586
L – 8V7880| B-5| 4 CONTACTS| •| B – 8Y7586
Primary Steering Control| E-5
A| B – 9Y7586 RR-8Y7832| B-5| •| B – 8Y7586
Secondary Steering Control| E-5
4| N – 8Y7958 8Y7959 Plug As| C-3| A| B – 8Y7586 PP – 1019161| C-6
•| Z – 1015308 Attachment Intermittent Wiper Switch| A-10| A| B – 8Y1586
Air Inlet Heater Attachment| B-6

Machine locations are repeated for connectors located close together.

= Connector is located at the component.
A = Components located in the dash.

Wire Description

Wire Description

Wire Number| Wire Color| Description| | Wire Number| Wire Color| Description
Power Circuits| Accessory Circuits
101| RD| BAT| 500| BR| WIPER – FRONT (PARK)
102| BU| HD LMP| 501| GN| WIPER – FRONT (LO)
105| BR| KEY START SW| 502| OR| WIPER – FRONT (HI)
106| WH| AUX CKT| 503| BR| WIPER – REAR (PARK)
109| OR| ALT OUTPUT (+) TERM.| 504| YL| WIPER – REAR (LO)
112| PU| MAIN POWER RELAY OUTPUT| 505| BU| WIPER – REAR (HI)
114| GN| WARNING HORN (FORWARD)| 506| PU| WASHER – FRONT
115| PK| AUX CKT| SOT| WH| WASHER – REAR
116| BR| AUX CKT| 513| OR| A/C COMPRESSOR/REFRIGERANT PRESS. SW
118| GY| AUX CKT| 515| GY| BLOWER MOTOR (HI)
120| YL| AUX CKT| 516| GN| BLOWER MOTOR (MEDIUM)
122| BU| AUX CKT| 517| BU| BLOWER MOTOR (LO)
123| WH| AUX CKT| 521| YL| A/C SW TO REFRIGERANT SW
124| GN| A/C| 522| WH| A/C CLUTCH TO THERMOSTAT SW
127| OR| AUX CKT| 537| GN| TURN SIGNAL SW TO FLASHER
128| PK| AUX CKT| 538| BR| HAZARD INDICATOR
129| BU| AUX CKT| Lighting Circuits
130| GN| AUX CKT| 603| PK| ROTARY BEACON
136| GN| SUPPLSTER| 604| OR| STOP LAMP
144| GN| AUX CKT| 605| YL| TURN LAMP – LEFT
160| PU| AUX CKT| 606| GY| TURN LAMP – RIGHT
Ground Circuits| 608| GN| FLOOD LAMP – REAR
200| BK| MAIN CHASSIS| 610| OR| HEAD LAMP BASIC
202| BK| XMSN CONT| 611| PU| HEAD LAMP HI
276| BK| XMSN CONT IDENT CODE 0| 612| GY| BACKUP LAMP
277| BK| XMSN CONT IDENT CODE 1| 614| PU| PARK/TAIL/DASH LAMP
278| BK| XMSN CONT IDENT CODE 2| 615| YL| CAB FLOOD LAMP/ROPS
279| BK| XMSN CONT IDENT CODE 3| 617| BR| TAIL/POSITION LAMP – LEFT (ROAD PKG)/WIDTH
280| BK| XMSN CONT IDENT CODE 4| 618| YL| TAIL/POSITION LAMP – RIGHT (ROAD PKG)/WIDTH
281| BK| XMSN CONT IDENT CODE 5| 619| GN| HEADLAMP LO
Basic Machine Circuits| Control Circuits
301| BU| STARTER NO. 1 SOL| 710| GN| XMSN SPEED PICKUP SIGNAL
304| WH| STARTER RELAY NO. 1 OUTPUT| 720| PU| XMSN BRAKE SW
306| GN| STARTER RELAY COIL TO NEUT START SW OR KEY SW| 751| GN| XMSN SHIFT SOL NO. 1 OR 3
307| OR| KEY SW TO NEUT START SW OR VMIS SENSOR MODULE| 752| YL| XMSN SHIFT SOL NO. 2
308| YL| MAIN POWER RELAY COIL| 754| BU| XMSN SHIFT SOL NO. 3 OR 1
309| GY| ALTERNATOR REGULATOR TERM.| 755| OR| XMSN SHIFT SOL NO. 4 OR 5
310| PU| START AID SW TO START AID SOL| 761| GY| LIFT KICKOUT SOL SW
311| WH| START AID SOL TO TEMP SW| 762| YL| BUCKET POSITIONER SOL SW
321| BR| BCKP ALARM LAMP TRAVEL ALARM| 900| PU| XMSN SHIFT SOL NO. 5 OR 4
322| GY| WARNING HORN (FORWARD)| 901| WH| XMSN SHIFT SOL NO. 6
326| PU| KEY SW “C” TERM.| 910| YL| XMSN NEUTIZER OVERRIDE INDICATOR
373| GN| START AID SW| 921| WH| XMSN SOL NO 1 OR 3 RETURN
Monitoring Circuits| 922| BR| XMSN SOL NO 2 RETURN
403| GN| ALTERNATOR (R) TERM.| 923| GY| XMSN SOL NO 3 OR 1 RETURN
409| OR| OPR MON NEUT| 924| GN| XMSN SOL NO 4 OR 5 RETURN
410| WH| OPR MON FAULT ALARM| 925| YL| XMSN SOL NO 5 OR 4 RETURN
416| OR| SUPPL STER SW| 926| BU| XMSN SOL NO 6 RETURN
417| GY| PRIMARY STER SW| 944| OR| CMS COMM (+)
419| YL| OPR MON PARKING BRAKE| 945| BR| CMS COMM (-)
441| OR| ENG COOLANT TEMP GAGE| 963| GN| BUCKET/FORK POSITION DETENT COIL
443| YL| POWER TRAIN TEMP GAGE| 964| BU| FORK POSITION SELECT
447| PK| FUEL LEVEL GAGE| 965| WH| TRANS SOL 1 SW TO GND
449| BU| SPDOM SENDER (SIGNAL NO. 1)| 966| GY| TRANS SOL 3 SW TO GND
450| YL| TACH SENDER (+)| 967| BU| TRANS SOL 1 & SOL 3 SW TO B+ (CST ONLY)
453| PK| SUPPL STER FAULT LAMP| 968| BR| TRANS SOL 2 SW TO GND
464| GY| OPR MON PANEL ENG OIL PRESS. SENSOR| 969| YL| TRANS SOL 3 SW TO B+
483| BR| BRAKE FLUID LEVEL| 970| GN| TRANS SOL 4 SW TO GND
484| YL| PRIMARY STER LAMP| 971| YL| TRANS SOL 5 SW TO GND
| | | 972| BU| TRANS SOL 6 SW TO GND
| | | 973| BR| CST AUTOSHIFT – AUTO/MANUAL SW 2
| | | 974| PU| CST AUTOSHIFT – SLOW MODE SW
| | | 975| WH| CST AUTOSHIFT – SOL RETURN
| | | 976| OR| RIDE CONT SOL
| | | 977| YL| CST AUTOSHIFT – AUTO/MANUAL SW 1
| | | 978| GN| CST AUTOSHIFT – SLOW MODE SW 1
| | | 920| GY| FAULT LAMP – CONTROL

ALL DASHED LINES ARE ATTACHMENTS.

| WIRES THAT HAVE BATTERY VOLTAGE WHEN THE KEY SWITCH IS OFF.
---|---
| WIRES THAT HAVE BATTERY VOLTAGE WHEN THE KEY SWITCH IS ON.
| STARTING CIRCUIT.
| GAUGE CIRCUIT.
| MONITOR CIRCUIT.
| PANEL LAMP CIRCUIT.
| WIPER/WASHER CIRCUIT.
| HEATER AND AIR CONDITIONER CIRCUIT.
| GROUND CIRCUIT.
| ENGINE SHUTDOWN CIRCUIT.
| TURN SIGNAL CIRCUIT.
| START AID CIRCUIT.
| TRANSMISSION SHIFT CONTROL CIRCUIT.

Resistor, Sender and Solenoid Specifications

Component	Part No.	Resistance (Ohms)’
Resistor – Alternator	617864	39 ± 1.95
Resistor – Blower Motor Speed	9G1950	Overall 2.0 ± 1; Tap 1.0 ± 0.5
Solenoid – Air Conditioner Clutch	818813	14.4 ± 0.6
Solenoid – Bucket	915679	108 ± 5.5

Solenoid – Engine Shutdown
Start (Latch) Coil
Stop(Latch) Coil| 8C-3663| Latch Coil; 1.55 ± 0.16
Unlatch Coil: 10.3 ± 1.0
Solenoid – Lift| 9T5678| 108 ± 5.5
Solenoid – Ride Control| 9X3267| 17.8 ± 0.9
Solenoid – Sart Aid| 3E6332| 6.0
Solenoid – Transmission| 3E6269| 33.8 ± 1.0

¹ At room temperature.

Off Machine Switch Specifications

Part No.| Function| Actuate| Deactuate| Contact Position
---|---|---|---|---
3E6449| Coolant Start Temperature (Start Aid)| 38 ± 3°C
(100 ± 5°F)| 26.7°C MIN 26.
(80°F MIN)| Normally Closed
3E7810| Primary Steering Oil Flow| 4 grams (.14 oz)| 1. 5 grams (.05 oz)| Normally Open
8T8639| Refrigerant Pressure (NC)| 345 ± 35 kPa MAX (50 ± 5.0 psi MAX)| 170 ± 20 kPa MIN
(25 ± 3.0 psi MIN)| Normally Closed
9X1035| Secondary Steering Oil Flow| 4 grams (.14 oz)| 1.5 grams (.05 oz)| Normally Open

¹ A hysteresis band exists: with increasing pressure the closed condition can be maintained up to 2800 kPa (405 psi), with decreasing pressure the closed condition can be maintained down to 170 kPa (25 psi).
² Contact position at the contacts of the harness connector.

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